Patent GB-429037-A (GB)
Title: Improvements in measuring and delivering apparatus for petrol and the like
IPC: B67D7/16
Filed: 1933-11-25
Abstract: 429,037. Delivering measured quantities. JAMIESON, A. C., 15, Bradford Avenue, Kew, Victoria, Australia. Nov. 25, 1933, No. 33007. Convention date, Nov. 25, 1932. [Class 102 (i)] [See also Group XVIII] Apparatus for delivering measured quantities of petrol and the like comprises a bowl or receptacle, a single-acting reciprocating plunger pump for delivering liquid from a reservoir to the bowl, said pump having a displacement volume at least as large as the maximum effective capacity of the bowl, power means for operating the pump, manually controlled means for initiating the operation of the power means and automatic control means for discontinuing the operation of the pump when a required volume of liquid has been delivered to the bowl or receptacle. A transparent measuring bowl 10, Figs. 1 and 3 supported by standards 12 is provided with an outlet pipe 80 and an inlet pipe 15 extending from a reciprocating pump 16 connected by a pipe 17 with an underground storage tank. The pump is reciprocated by means of a fluid actuated piston operating in a cylinder 26, and adjustably connected by a rod 28 to a pivoted lifting arm 24, Fig. 5, connected with the pump piston 19 by rods 21, 22. The upper end of the rod 28 is provided with two wedging blocks 31 enclosed within the lower ends of gripping levers 33 slidably mounted on the lifting arm 24. By means of a flexible cable 41 attached to a piston subject to the pressure of the driving fluid supplied to the cylinder 26, the gripping levers are urged towards the pivoted end 25 of the lever 24 against the action of a spring 44 so that the leverage exerted on the lifting arm is automatically adjusted to correspond to the pressure of the driving fluid. On the admission of the fluid to the cylinder 26 the initial upward movement of the rod 28 and blocks 31 causes the gripping levers to become locked on the arm 24. The apparatus may be set so that the pump delivers to the bowl 10 approximately the amount of petrol required and to this end includes a selector spindle 47, Fig. 13, having at regular intervals cams 51 each having a radial projection, the projections being disposed at progressively increasing angular displacements from a neutral position. The spindle may be set by means of a pinion 48 engaging a graduated rack 49. A lift block 53 connected by a rod 54 with the lifting arm 24 is provided with an upstanding projection 55 on which rests the lower pointed end of a lift rod 56 influenced by a torsion spring 58 so that one edge of a control bar 59 secured in spaced relation to the lift rod is maintained in engagement with the cams 51. The upper end of the control bar is formed with a series of rack teeth 61 the pitch of which corresponds to the spacing of the cams. Bearings 63 on a fixed bracket 62 support guide rods 64 and 65 attached to a trip block 66. Secured to the guide rod 65 below the block is a driving plate 67, Fig. 12, which normally rests on the upper rack tooth 61 of the control bar 59. When the selector spindle is set the cams thereon bear against and rotate the control bar so that the driving plate is released and descends to a stop collar 67<1>. This, in turn causes a downward movement of a slidable member 68 embraced by a forked member 71 mounted on a spindle 70 which also carries a hand lever 72 and an arm connected by a rod 74 with the operating arm 75 of the valve 30 which is urged to the open position by a spring or by the weight of the connecting rod 74. Thus the descent of the driving plate 67 allowed by the setting of the selector spindle and the consequent rotation of the control bar allows the opening of the valve 30 for the admission of pressure fluid to the driving cylinder 26. If the selector spindle is set for the delivery of say three gallons, the rotation of the spindle causes the third cam from the lower end to hold the control bar in a rotated position and delivery begins. The lift block 53 is raised in unison with the lift arm 24 and pump piston 19 until the lower end of the bar passes the third cam, whereupon the torsion spring returns it to the normal angular position. As the bar continues to rise, one of the teeth 61 engages beneath and raises the driving plate 67 together with the trip block 66 and member 68. This results in a partial rotation of the forked member and consequently a partial closing of the valve 30. Further upward movement of the member 68 is temporarily prevented by the lower end of a pawl 76 but the trip block 66 continues to rise and a screw 77 thereon engages the upper end of the pawl, disengaging it from the member 68 which moves rapidly upwards under the action of a spring 69 to cause a rapid cut-off of the valve 30. In order to connect the driving cylinder to exhaust, the valve is operated by a further manual movement of the hand lever 22 and the pump piston, lift arm and other parts descend to their normal positions. During the descent of the control bar the driving plate is prevented from descending below its normal position by a pivoted gravity catch 78. The arm 73 is connected with the outlet valve of the bowl 10 through push rods 81, 82, allowing lost motion when the lever is moved to open the valve 30. As the lift block 53 reaches its normal position it engages an arm 86 and releases said arm from a projection 85 on the connecting rod 74 allowing the valve to return to the intermediate position. A vertical overflow pipe 88 extends into the bowl 10 and may be adjusted manually in the usual manner. A lift bar 93 attached to the bar rests on an adjusting screw 94 on the lift block 53 and is raised therewith. When. pumping ceases a handle 91 on the overflow pipe is moved manually into the appropriate notch in a rack 92. This movement takes the bar 93 out of alignment with the screw 94 and allows independent adjustment. A horizontal bar 95 is provided at one end with a roller 96, Fig. 17, engaging one edge of the lift bar and when the handle 91 is moved the bar is shifted laterally out of the path of a projection on the valve rod 74. Thus the valve cannot be turned to the discharge position until the handle 91 has been inserted in the rack 92. Similarly after the valve has moved to discharge, the bar 95 and consequently the overflow pipe 88 are locked in position until the descent of the lift block 53 engages the arm 85. The apparatus may be so arranged that the selector spindle can be set for the delivery of the full amount to the bowl by the actuation of a ground lever 112, Fig. 22 as by a wheel of a vehicle stopping by the pump. The lever is normally kept vertical by a counterweight 114 and supports a weight 111 attached to a cable 109 wound round a drum 108 on the lower end of the selector spindle. Depression of the lever releases the weight 111 and the spindle is rotated to the maximum extent. In a modified form of apparatus in which petrol may be left in the bowl pending sale, the lower end of an overflow pipe 100, Fig. 20, extends down into a chamber 101 provided with the delivery outlet 80. The overflow pipe is operated by a rod 102 having a handle 103 adapted to engage a measuring rack 104 and is provided with an extension 105 supporting a trip block 107. If the bowl contains five gallons and only three are required, the overflow pipe is lowered and three gallons above the top run off through the outlet 80. As the lift block 53 descends during this delivery, a projection thereon engages the trip block 107 which in turn moves the arm 86 to release the connecting rod 74. The valve 30 then moves to the neutral position preventing further discharge of driving fluid from the cylinder 26 and further descent of the lift arm 24.